External surface of a duck blind boat cover



FIG. 1 is a side elevation view of an external surface of a duck blind boat cover showing my new design;

FIG. 2 is a side elevation view thereof opposite to the side shown in FIG. 1;

FIG. 3 is an enlarged front elevation view thereof;

FIG. 4 is an enlarged rear elevation view thereof;

FIG. 5 is a top plan view thereof, the opposite bottom surface being unornamented and not constituting part of the present design; and,

FIG. 6 is a fragmented enlarged sectional view taken along line 6--6 in FIG. 5. 

The ornamental design for an external surface of a duck blind boat cover, as shown and described. 